Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef DEBUG
       7             : static_assert(false, "This should not be compiled in !DEBUG");
       8             : #endif // DEBUG
       9             : 
      10             : #include "nsAutoLayoutPhase.h"
      11             : #include "nsPresContext.h"
      12             : #include "nsContentUtils.h"
      13             : 
      14         298 : nsAutoLayoutPhase::nsAutoLayoutPhase(nsPresContext* aPresContext,
      15         298 :                                      nsLayoutPhase aPhase)
      16             :   : mPresContext(aPresContext)
      17             :   , mPhase(aPhase)
      18         298 :   , mCount(0)
      19             : {
      20         298 :   Enter();
      21         298 : }
      22             : 
      23         596 : nsAutoLayoutPhase::~nsAutoLayoutPhase()
      24             : {
      25         298 :   Exit();
      26         298 :   MOZ_ASSERT(mCount == 0, "imbalanced");
      27         298 : }
      28             : 
      29             : void
      30         478 : nsAutoLayoutPhase::Enter()
      31             : {
      32         478 :   switch (mPhase) {
      33             :     case eLayoutPhase_Paint:
      34          29 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
      35             :                  "recurring into paint");
      36          29 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
      37             :                  "painting in the middle of reflow");
      38          29 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
      39             :                  "painting in the middle of frame construction");
      40          29 :       break;
      41             :     case eLayoutPhase_Reflow:
      42          68 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
      43             :                  "reflowing in the middle of a paint");
      44          68 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
      45             :                  "recurring into reflow");
      46          68 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
      47             :                  "reflowing in the middle of frame construction");
      48          68 :       break;
      49             :     case eLayoutPhase_FrameC:
      50         381 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
      51             :                  "constructing frames in the middle of a paint");
      52         381 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
      53             :                  "constructing frames in the middle of reflow");
      54         381 :       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
      55             :                  "recurring into frame construction");
      56         381 :       MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript(),
      57             :                  "constructing frames and scripts are not blocked");
      58         381 :       break;
      59             :     case eLayoutPhase_COUNT:
      60           0 :       break;
      61             :   }
      62             : 
      63         478 :   ++(mPresContext->mLayoutPhaseCount[mPhase]);
      64         478 :   ++mCount;
      65         478 : }
      66             : 
      67             : void
      68         478 : nsAutoLayoutPhase::Exit()
      69             : {
      70         478 :   MOZ_ASSERT(mCount > 0 && mPresContext->mLayoutPhaseCount[mPhase] > 0,
      71             :              "imbalanced");
      72         478 :   --(mPresContext->mLayoutPhaseCount[mPhase]);
      73         478 :   --mCount;
      74         478 : }